<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<!--组件实例对象-->
<div id="app">
  <cpn></cpn>
  <cpn></cpn>
  <cpn></cpn>
</div>

<template id="cpn">
  <div>
    <h2>当前计数：{{counter}}</h2>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
  </div>
</template>
<script src="../js/vue.js"></script>
<script>
  // 1.注册全局
  Vue.component('cpn',{
      template:'#cpn',
      data(){
          return{
              counter: 0,
          }
      },
      methods:{
          increment(){
              this.counter++
          },
          decrement(){
              this.counter--
          },
      }
  })

    const app = new Vue({
        el:'#app',
        data:{
            message:'你好呀'
        }
    })
</script>

</body>
</html>